Right earphone wont work.

Rotating the jack or twisting the wire joint on the headset might work.

If you hear sounds from only one earphone then most likely there is a broken wire to the earphone that is not producing a sound.
It is difficult to determine exactly where the wire is broken and repair. I suggest you get a new earphone.

three possible scenarios, either the balance ( left/right) setting of menu are set to favor right vs. left. the earbud cable is not seated properly or defective sometimes the earphone jack itself on MP3 is not making contact, or broken speaker inside earplug

Headphone jack compromised

You have fault in the wires that has been twisted and open/ shorted within losing the connectivity. The best thing is to get this replaced if you can do the work by yourself, you will have to buy the shielded twin core wires, one headphone stereo jack, open the earpiees carefully- it is tricky,so do it gently, solder the wires in accordance with the lead and shield on either sides and then connect to the stereo headphones. Hope this wil work out for you. Good day

Sounds as though either the earphone's Plug isn't the right size or plug end shape... OR the actual Jack is faulty, and only making intermittent connections... or the wire to them is broken. What is best is take the MP3 unit along when buying any head/earphones and try them in shop.. As for Walmart... Talk to a manager and demand a refund or a change of type... Don't take NO for an answer. Also you don't need to spend that amount for them... any cheap pair that works will be OK. Try before you buy.

your ear input female jack is stripped try another new pair of earphones if not you may have to take it in for service.

I inserted a drill bit that fits the exact size of the aperture and twisted it around a few turns and it is working better.

Heath Robinson eat your heart out

the wires in your headphones are broke my sugestion is to get a new pair

I had this very problem. The Sansa worked great for over 1 year, but then I started getting some dropping out of sound on the left side. Today I went to an electronic shop and they opened up the unit. There was a small crack in the solder of the earphone jack on one side. So the electrician just used a fine point solder and fixed that, then strengthened the other solder points of the jack to make sure it won't happen again... I hooked in the earphones....and it is PERFECT again!!!! So, don't lose hope...just take it in to a decent electronics shop and they will most likely be able to fix your problem. And he only took around US$10 for the job. Beats buying a new player...